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Photoregulation of seed germination of wild‐type and of an aurea ‐mutant of tomato
Author(s) -
Lercari B.,
Lipucci di Paola M.
Publication year - 1991
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1991.tb02151.x
Subject(s) - phytochrome , germination , mutant , far red , lycopersicon , red light , wild type , darkness , botany , horticulture , biology , biochemistry , gene
Seed germination of an aurea mutant of tomato ( Lycopersicon esculentum Mill.) is promoted by continuous irradiation with red, far‐red or long‐wavelength far‐red (758 nm) light as well as by cyclic irradiations (5 min red or 5 min far‐red/25 min darkness). Far‐red light applied immediately after each red does not change the germination behaviour. Seed germination of the isogenic wild‐type, cv. UC‐105, is promoted by continuous and cyclic red light while it is inhibited by continuous and cyclic far‐red light and by continious 758 nm irradiation. Far‐red irradiation reverses almost completely the promoting effect of red light. The promoting effect (in the aurea mutant) and the inhibitory effect (in the wild‐type) of continuous far‐red light do not show photon fluence rate dependency above 20 nmol m −2 s −1 . It is concluded that phytochrome controls tomato seed germination throgh low energy responses in both the wild type and the au mutant. The promoting effect of continuous and cyclic far‐red light in the au mutant can be attributed to a greater sensitivity to P fr .